Hot liquid pump



Jul 13, 1948. E, a SCHWENK 2,445,127 HOT LIQUID PUMP Filed May 15, 1946 I: I t t T MIME/wok so 32 Earl Bic/wank l5 nrronwzv Patented July 13, 1 948 .1101: LIQUID PUMP I Earl B. Schwenk, Scattle,- Wash.

I 7 Application May 15, 1946, Serial No. 6i i9 9 68 .2 Claims. (01. 103-44) e u a V 1 This invention relates to a pump that is particularly well adapted for pumping hot liquid.

.An object of. this invention is to provide a pump thatwill pump hot liquid efliciently without damage to the pump.

Much difficulty is experienced in the operation of pumps that handle hot liquid on account of thedamaging effect of the heat on parts of the pump, such as cupleathers and the like.

-Itis an object of this invention to provide an eillcient pump in which the hot liquid that is being handled is efficiently pumped past a series OfzChBOk valves without passing through the pump or cominginto heat exchanging contact with the operating parts of the pump.

Another object of this invention is to provide a pumpin which an upright conduitifilled with cool liquid is; connected at its upper end with another. conduit through which hot liquid is being pumped and at its lower end with pulsator mechanism, said upright liquid conduit being of substantial length and the liquid in said upright conduit constituting a liquid plunger of at least twice the volume displaced by each stroke of the pulsator said-liquid plunger being cool and serving as a barrier to prevent an objectionable amount of heat from the hotliquid from reaching the pulsator. V

Another object is to provide a pump of this type in which the liquid forming the upright liquid plunger is of greater specific gravity than the hot liquid which is being pumped and in which this difference in specific gravity may be due solely to a difference of temperature between thenliquid forming the liquid plunger and the liquid being pumped or may be due tothe-use, for-the liquid plunger, of a liquid that has a greater specific gravity than the liquid being pumped when the temperatures of the two liquids are equal. i I

Another object is to provide a pump of this type in'which the conduit wherein the liquid plunger operates is formed so as to provide a loop portion below the level of the pulsator and forming a sediment trap.

Another object is to provide a pump of this type that 'isj especially well adapted for pumping hot water and one that .can successfully use cooler water as a liquid plunger. in pumping'the hot water; T

Other'objects of'the invention will be apparent from'the following description taken in connec-" tion; with the accompanying drawings.

In thedrawings v Fig.1, illustrating double acting pump means constructed in accordance with this invention. -f-; Fig. 3 isa side elevationof the pump means single acting hot liquid in accordance with this invention, I Y

Fig- 2 is'a plan view, on a smaller scale than shown in Fig.2. 1 1- 7 Referring first to Fig. 1, I

an eccentricdisc 1. The disc I is secured n a driven shaft 8 andispositioned within a' yokerri' 9 thatis rigid with theplunger 6 and 'carriesia ring In that isgrotatively. supported on ballor roller bearings l l and engages the yoke 9.5a cup) leather l2 maybe providedon the end. portion of the plunger 6 Within the cylinder 5. Preferably the cylinder 5 has a head [3 and isrprovided.

adjacent said head I'3 with two ports l4 and: [5.

A screwplug-IG. is threaded intoone of these;v ports such as the uppermost'portv l4. This screwi; plug is usefulin that it may be removed to permit theescape of entrapped air, particularly at the time the pump is filled with. liquid -preparatory to being put into operation.

The lowermost port 15 is connected with a liquid plunger conduit comprising a downwardly] extending loop portion 1l1,that extends down-.1 wardly and to one side, and another portion .18 that extends upwardly. A trap I9 is preferably provided at the lowermost portion of the loop conduit member I! to catch any sediment that.

may tend to settle through the upright conduit member". 7

The upper end portion of the conduit member I8'is connected, as by a T member 20, with. a, t

Two check valves 22 and.23'are interposed inthe conduit 2| on oppo- Y These check liquid conduit member 2 I.

portion 'of conduit 2| shown at the left of the -valve 22 in Fig 1 is connected with a source of supply f hot liquid and the portion of conduit pum means constructed show' a pulsator ofthe reciprocating piston type which may be of standard construction. This Lpulsator' comprises a cylinder 5 having therein a plunger 6 adapted to be reciprocated b any suitable means, such as ditec i 2| shown at the right of the valve 23 in Fig. 1 extends to any suitable location where hot liquid is to be delivered. Assuming the pulsator and conduits l1, l8 and 2| to be thus supplied with cool and hot liquid, then when the plunger 6 is reciprocated the cool liquid in the pulsator and conduits I1 and [8 will be reciprocated like a piston. As a result of this reciprocating action of the cool liquid hot liquid will be pumped continuously through the conduit 2| and past the check valves'22 and 23 inthe direction indicated by the arrows in Fig. 1. After the device is functioning normally an amount of hot liquid about equal to the displacement of one stroke of the pump plunger 6 will descend into the upright conduit l8 upon each retractile stroke of the 4 tinuous conduit 36 at spaced apart points. Four check valves 39, 40, 4| and 42 are interposed in the continuous conduit 36, between the points of connection of pipes 34, 31, 35 and 38 with said conduit 36. The check valves 39, 40, M and 42 are positioned so they will permit liquid to flow in the directions indicated by the arrows but will prevent liquid from flowing in the opposite directions. In some instances it may be desirable to use two check valves in tandem instead of single check valves as shown, so that if one of said check valves should stick and fail to operate properly the other check valve of the pair will control the flow of liquid and the pump will conplunger 6 and an equal amount of hot liquid" hot liquid in the upright conduit l8 will be'forced back up into the conduit 2| and an equal amount of hot liquid will b discharged past the check valve 23.

The hotliquid that enters the conduit l8 will not 'mix, to any substantial extent with the cooler liquid therein, but will stay on topof the cooler liquid... The cooler liquid, due to its lower temperature, has a greater specific gravity than the hot liquid and tends to remain in the bottom of the conduits I8 and [1. Thus it is practical to use a liquid plungerof cool water in the conduits l1 and I8 for. pumping hot water through conduit 2 I.

In pumping hot water I find that very littleheat reaches the pulsator, even during long periods of continuous operation, when cooler water is used as the liquid plunger and when theupright conduit I8 is of substantial length and when the volume of the upright conduit I8 is two :or more times the volume of liquid displaced by one stroke of the pulsator plunger.

If the hot liquid that is being pumped carries heavy foreign substances, such as scale or sediment, that tend to settle in the upright conduit l8 these substances will be caught in the trap l9 and can be removed before they have a chance to enter the pulsator.

In some instances it may be desirable to have the liquid plunger formed of a liquid of substantiallygreater specific gravitythan .the liquid that is being pumped. For instance mercury canbe used as a part of the liquid plunger in the lower portion of the conduit loop l'l-I8.

Figs. 2 and 3 show a two cylinder or duplex.

pulsator togetherwith conduits and check valves arranged in accordance with this invention. Said tinue to operate efliciently.

Unions 43 may be used in the conduits where necessary.

The ;.0peration,-of the double pump shown in. Figs. 2 and 3 is similar to the operation of the single pump shown in Fig. 1. Each piston 27 and 28 operates a liquid plunger of cool liquid in the conduit 34 or .35 connected therewith. These pulsating liquid plungers alternately draw inhot liquid through the intake pipe 31 and discharge said hot liquid through the outlet pipe 38. The liquid in the conduits 34 and 35 will continue to operate at a relatively low temperature and will prevent objection-able heating of the pulsators 25 and 26 by the hot liquid that is being pumped through theconduit 36. v

The foregoing description and accompanying drawings clearly disclose a preferred embodiment of this invention but it will be understood that this disclosure is merely illustrative and that changes may be made within the scope of the following claims.

I claim:

1. Means for pumping hot liquid comprising a continuous run'of conduit; a hot liquid inlet pipe connected therewith; a'hot liquid outlet pipe connected with said continuous run of conduit at a point spaced from th'epoint of connection therewith of said hot liquid inlet pipe; two reciprocating plunger pulsators positioned below said continuous run of hot liquid conduit; two J-shaped conduits adapted to contain cooler liquid, each J-shaped conduit having a loop portion extending below one ofsaid pulsators and having a shorter branch connected with said pulsator and having a a longer branch connected with said continuous run of conduit, the points of connection of said Figs. 2 and 3 show two pulsator cylinders25 and yoke 29. Yoke reciprocating means in the nature of an eccentric disc 30 on a driven shaft 3| provided with a ballor roller bearing ring 32 is shown. The ring 32 reacts against two opposed reaction surfaces 33 of the yoke 29 and reciprocates the yoke in a manner hereinbefore explained in connection with Fig. 1. The parts 25 and 33 inclusive are similar to corresponding parts shown in Fig. 1 and function in a similar manner.

Two liquid plunger conduits 34 and 35, each of J shape similar to the conduit l1-|8 of Fig. 1, :connect the respective pulsator cylinders 25 and 2G.with a continuous run of hot liquid conduit 35. A hot liquid inlet pipe 31 and a hot liquid outlet pipe 38 are connected with the conlonger branches withsaid continuous conduit beingvat opposite sides of said hot liquid inlet and outlet pipes; and four check valves in said continuous conduit positioned so that a check valve is interposed between each J-shaped conduit and each hot liquid pipe that connects with said continuous run of conduit, each of said check valves permitting a flow of hot water from said inlet to said outlet pipe and preventing a flow of hot water in the opposite direction.

2, Means for pumping hot liquid comprising a continuous run of conduit; a hot liquid inlet pipe connected therewith; a hot liquid outlet pipe connected with said continuous run of conduit at a point spaced from the point of connection therewith of said hot liquid inletpipe; two reciprocating plunger pulsators positioned a substantial distance below said continuous run of. hot liquid conduit; two J-shaped conduits adapted to con- I tain cooler liquid, each J-shaped conduit having a 3 points of connection of said longer branches with said continuous conduit being at opposite sides of said hot liquid inlet and outlet pipes, the volume of liquid carried by the longer branch of each conduit being at least twice as great as the volume of liquid displaced by one stroke of said pulsator; a sediment trap provided in the lowermost portion of the loop of each J-shaped conduit; and four check valves in said continuous conduit positioned so that a check valve is interposed between each J-shaped conduit and each hot liquid pipe that connects with said continuous run of conduit, each of said check valves permitting a flow of hot water from said inlet to said outlet pipe and preventing a flow of hot 15 Water in the opposite direction.

EARL B. SCHWENK.

REFERENCES CITED UNITED STATES PATENTS Number Name Date 759,145 Wing May 3, 1904 1,342,798 Farrand June 8, 1920 1,650,377 Nixon Nov. 22, 1927 2,241,620 Shoeld May 13, 1941 FOREIGN PATENTS Number Country Date 295,10 1 Great Britain 1928 123,475 Germany 1901 

